<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<style>
			*{
				margin:0;
				padding:0;
			}
			#box{
				/* width:80%; */
				/* width:80vw; */
				width:calc(100% - 20vw);
				height:50vh;
				background-color: #00BFFF;
				margin:0 auto;
			}
		</style>
	</head>
	<body>
		<div id="box"></div>
	</body>
</html>
